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| Patents for John W. Calkins | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 181,310 | Aug. 22, 1876 | J.W. Calkins | Improvement in machines for sawing laths | |
 | 186,795 | Jan. 30, 1877 | J.W. Calkins | Improvement in machines for sawing laths | |